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As others have hinted, it also kind of depends on what your 'city' driving situation is like, as you've given no real details. If you were in bumper-to-bumper traffic and idling a lot of the time, your mileage is going to be much worse than, say, a city with minimal traffic where you know the lights well enough to time them, etc.
I've been able to raise my city MPG to about highway levels by just turning the engine off at red lights and accelerating judiciously. With auto, you can't EOC as effectively as I can with a manual transmission (no bump starting), but you should be able to pop it into neutral and turn the engine off when you're going to have to wait awhile in traffic or at a light.
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